Menu bar for group, event, etc.

I replaced the template echo with vanilla.:D As I mentioned in a request (https://stackideas.com/forums/menu-bar-for-group-page-event-view), I wish that the menu bar for the group, event, profile , etc. uses the whole width on a desktop screen.
In the demo for Vanilla I saw that this has already been done.
So that I can reproduce the demo version, I would have to know how to do that. Please advice.
Regards,
Martin
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